docs: def slugify_argument(func):
      """
      Wraps a function that returns a string, adding the 'slugify' argument.
  
      >>> slugified_fn = slugify_argument(lambda *args, **kwargs: "YOU ARE A NICE LADY")
      >>> slugified_fn()
      'YOU ARE A NICE LADY'
      >>> slugified_fn(slugify=True)
      'you-are-a-nice-lady'
  
      """
      @six.wraps(func)
      def wrapped(*args, **kwargs):
          if "slugify" in kwargs and kwargs['slugify']:
              return _slugify(func(*args, **kwargs))
          else:
              return func(*args, **kwargs)
      return wrapped